package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("filter正在过滤{}", request.getRequestURL());


//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
        };
//        2、判断本次请求是否要处理
        boolean check = check(urls, requestURI);
//        3、如果不需要处理，直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }
//        4-1、判断登录状态，如果已登录，直接放行
        Object employee = request.getSession().getAttribute("employee");
        BaseContext.setCurrent((Long) employee);

        if (employee != null) {
            log.info("用户已登录，id：{}", request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }
//        4-2、判断登录状态，如果已登录，直接放行
        Object user = request.getSession().getAttribute("user");
        BaseContext.setCurrent((Long) user);

        if (user != null) {
            log.info("用户已登录，id：{}", request.getSession().getAttribute("user"));
            filterChain.doFilter(request, response);
            return;
        }
//        5、如果未登录，则返回未登录结果
        log.info("用户未登录:{}",request.getRequestURL());
        log.info("拦截到请求{}", requestURI);
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));


    }


    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
